Situation when The refrigerator stops freezing, but the light is on inside, which often confuses the owner. In most cases, especially if the unit hums for a couple of seconds, and then there is a click and there is silence, the culprit is a faulty start relay. This is a small but critical part responsible for starting the compressor engine. Understanding exactly where it is located is the first step towards independent repair or a competent dialogue with a technician.
Equipment Atlant is characterized by a certain standardization of components, however, the location of the protective starting device may vary slightly depending on the year of manufacture and model. Most often, the unit is hidden in a niche adjacent to the compressor, which is located at the lower rear of the refrigerator. To get to it, you don’t need to disassemble the entire case; just remove the back cover or the motor protective casing. It is important to understand that a relay is not just a switch, but a complex electromechanical unit that supplies voltage to the motor windings.
Design and role of the starting relay
The starting relay in refrigerators Atlant performs the function of an automatic switch. When the compressor is turned on, the voltage necessary to create torque is applied to its windings. As soon as the motor rotor reaches the desired speed, the relay opens the starting circuit, and the motor continues to operate on the main winding. If this mechanism jams or burns out, the compressor cannot start, which we hear as periodic clicks.
Modern models are often equipped with thermal relayswhich also perform a protective function. They monitor the temperature of the compressor housing and the current strength. When overloaded or overheated, the circuit breaks, preventing the expensive engine from burning out. In older models, there may be purely mechanical devices operating on the principle of electromagnetic attraction, but in the lines Atlant recent years, combined units dominate.
- 🔌 Contact group —provides the closing and opening of the electrical circuits.
- 🌡️ Thermal protection —a bimetallic plate that responds to overheating.
- ⚙️ Mechanism switching —a movable core or rod that controls the contacts.
⚠️ Attention: An attempt to start a refrigerator with a faulty or “jammed” relay can lead to permanent failure of the compressor. If you hear a hum that lasts more than 5-10 seconds, immediately unplug the device.
The exact location of the unit in different models
The search for a relay in the refrigerator Atlant always starts from the back wall of the unit. You will need to move the refrigerator away from the wall, allowing access to the bottom. The compressor is usually enclosed in a metal or plastic casing that is secured with latches or bolts. After removing this protection, you will see the motor-compressor itself, and on the side of it, on protruding pins, the part you are looking for will hang or stand.
In most models, such as Atlant 4008 or 4502, the relay is attached directly to three pins, coming out of the compressor. It can be closed with an additional plastic cap, which must be carefully removed. In some two-chamber models with a system No Frost access may be slightly hampered by elements of the condensate drainage system, but the principle remains the same: look for the box connected to the motor.
If you do not see the relay right away, inspect the space around the compressor more carefully. Sometimes it can be fixed to the wall of the niche using a clip, and go to the compressor contacts through a short wiring harness. However, equipment Atlant is characterized by a direct fit on the motor terminals, which simplifies diagnostics.
Symptoms of malfunction and diagnostics
Before you start replacing, you need to make sure that the problem lies in the relay. The most striking symptom is the cyclic turning on and off of the motor. The refrigerator tries to start, a characteristic click is heard, after which there is silence, and after a while the cycle repeats. This indicates that the starting winding does not receive an impulse or the circuit is immediately opened by the protection.
Another sign may be a complete failure of the compressor to turn on when the lighting inside the chamber is on. If the relay body itself is very hot or has traces of soot and melting, the diagnosis is obvious. Visual inspection is an important step: remove the part and shake it near your ear. If a rattling sound is heard inside, it means that the mechanism is damaged and requires replacement.
- 🔊 Clicks —a regular knock every few minutes indicates the protection is working.
- 🔥 Heating —excessive temperature of the relay body indicates a breakdown or overload.
- 🚫 No startup —the motor hums, but does not start, or is completely silent.
For accurate diagnostics, you can use a multimeter. Ring the relay contacts in different positions. The resistance must correspond to the values stated in the technical documentation (usually a few ohms for a working circuit and infinity for an open circuit). If the device shows an open or short circuit where they should not be, the part is faulty.
Comparison of relay types for Atlant refrigerators
When selecting spare parts, it is important to consider that the manufacturer used different types of starting devices in different years. The main difference lies in the principle of operation and method of fastening. Understanding these differences will help you avoid mistakes when purchasing a new part, since they may be similar in appearance, but have a different electrical circuit.
| Relay type | Principle of operation | Characteristic Atlant models | Replacement features |
|---|---|---|---|
| Posistor (RTK) | Thermal expansion of ceramics | Modern (after 2010) | Requires cooling before restarting |
| Induction (RTP) | Electromagnetic attraction | Old models (before 2005) | Position sensitive (vertical only) |
| Combined | Start + thermal protection | Most models | Replaced with a single unit |
| RTK-1 | Posistor start | MXM-1700, 1800 | Compact size |
| RTP-0 | Electromagnetic | MXM-162, 163 | Requires strict orientation |
⚠️ Attention: Never install a relay designed for a different type of compressor or with a different operating current range. This can lead to instant burning of the motor windings.
Step-by-step instructions for replacing a part
Replacing a relay is a procedure accessible even to a beginner, if you follow safety precautions. First, completely turn off the power to the refrigerator by unplugging the plug from the outlet. This is critical since you will be working with live parts. Allow the compressor to cool for 15-20 minutes, if you have attempted to start it before.
Remove the rear protective cover of the compressor compartment. Locate the plastic box that fits over the compressor pins. Carefully disconnect the wires if they go through the connector, or simply remove the relay from the contacts if it is directly attached. In some cases, it may be necessary to loosen the clamp or remove the fixing bracket.
- 🛠️ Dismantling — remove the old relay, remembering or photographing the position of the wires.
- 🧹 Cleaning —wipe the compressor contacts from dust and oxides with a dry cloth.
- 🔌 Installation —install a new part, pushing it tightly onto the pins until it stops.
After installation, reassemble the structure in reverse order. Make sure the relay is tight and not loose. Plug in the refrigerator and listen. The startup should occur immediately, without prolonged beeps or clicks. If the motor is running smoothly, you can install the protective cover in place.
☑️ Check before turning on
Common mistakes during self-repair
One of the most common mistakes is ignoring the reason for the relay failing building. Often burnout does not occur on its own, but due to problems with the compressor itself or power surges in the network. Installing a new relay on a “tired” motor will only give a temporary effect, and after a short time history will repeat itself.
Also, amateur craftsmen often confuse the polarity or connect the wires incorrectly, especially if the connectors are not clearly marked. In induction relays, it is critical to maintain a vertical position: if you turn such a part upside down, it simply will not work or will work incorrectly.
⚠️ Attention: Technical characteristics of compressors and connection diagrams may vary depending on the specific batch of refrigerators. Always check the electrical diagram printed on the label inside the refrigerator compartment or in the technical data sheet.
Another mistake is using electrical tape to secure the contacts instead of a reliable connection. Under vibration and heat conditions, such compounds quickly oxidize and burn off, causing sparks and the risk of fire. All connections must be tight and reliable.
Is it possible to repair the relay yourself?
There are contacts inside the relay that sometimes burn out. Theoretically, they can be cleaned with fine sandpaper, but this is a temporary measure. The factory calibration of the shutdown current is violated, and the protection may not operate at the right time, which will lead to the compressor burning out. It is cheaper and safer to buy a new part.
Prevention and extension of service life
In order for the relay and compressor to serve for a long time, it is important to ensure good operating conditions. The refrigerator Atlant must be level, without distortions, so that the oil in the compressor is distributed correctly. Vibration is the enemy of any mechanical and electrical contacts, so check the legs of the unit.
Regular cleaning of the rear wall from dust and pet hair helps to avoid overheating of the compressor. A dust “felt boot” on the radiator grill causes the engine to work with increased load, which leads to overheating and the thermal protection of the relay is triggered. Wipe the back panel at least once every six months.
Use a voltage stabilizer if there are surges in your network. Sudden voltage drops are one of the main reasons for failure of starting electronics. Stable power supply significantly extends the life of all components of the refrigerator.
How to understand that the relay has burned out without disassembling?
If the refrigerator makes a loud click, then buzzes for 3-5 seconds, clicks again and goes silent, and it is warm inside - in 90% of cases the problem is in the start relay or the compressor itself. If the lighting inside is working, it means that voltage is supplied to the network.
Where to buy an original relay for Atlant?
Original spare parts are best purchased in specialized household appliance stores or authorized service centers of the brand. There are many analogues on the market that may be suitable in size, but differ in current characteristics, which is dangerous.
Is it possible to turn on a refrigerator directly without a relay?
Theoretically, you can start the motor by applying voltage directly to the working and starting windings, but this is absolutely impossible to do in a domestic environment. Without protection, the compressor will burn out in a matter of minutes or even seconds if the rotor jams.
Why does the new relay click, but the refrigerator does not freeze?
If the situation has not changed after replacing the part, the compressor itself may be faulty (interturn short circuit or wedge of the piston group). It is also worth checking the integrity of the supply wires and the presence of voltage at the input to the relay.